In a slow cooker, whisk together the chicken broth, crushed red pepper flakes, paprika, onion powder, garlic powder, salt, pepper, Sriracha, honey, and brown sugar until well combined.
Add the chicken breasts to the slow cooker and coat them in the sauce.
Place the sliced butter evenly over the top of the chicken.
Cover and cook on Low for 5 hours, or until the chicken is tender and easily shreds with a fork.
Remove the chicken from the slow cooker and shred it using two forks.
Return the shredded chicken to the slow cooker and stir to coat it in the sauce.
Serve on hamburger buns topped with sliced pickles and onions.
Notes
Whisk the sauce well before adding the chicken so the seasonings are evenly mixed.
Shred the chicken once it is tender and easily pulls apart with a fork.
Stir the shredded chicken back into the sauce before serving.
Serve with pickles and onions for the best balance with the sweet and spicy sauce.
Leftovers can be used in sandwiches, wraps, bowls, or over rice.